Fix: XanMod-Repo-Suite "releases" existiert nicht mehr

deb.xanmod.org/dists/releases liefert 404; das Repository ist mittlerweile
pro Debian-Codename organisiert (sid, trixie, bookworm, ...). Da dieses
Framework Debian Unstable (Sid) als Zielsystem hat, wird jetzt direkt die
Suite "sid" verwendet (per curl gegen deb.xanmod.org verifiziert).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017WMUd2fGsPCtTCVQkSS5TA

AGENTS.md

@@ -40,11 +40,11 @@ Dieses Repository ist ein modulares, automatisiertes Setup- und Konfigurations-F
 ├── stages/                          # Sequenziell und modular ausführbare Phasen (00 bis 11)
 │   ├── 00-preflight.sh              # Systemvoraussetzungen, Root/User-Erkennung, Internetverbindung
 │   ├── 01-apt-unstable.sh           # Deb822-Quellen, Keyrings, Pinning, apt-listbugs, dist-upgrade
-│   ├── 02-kernel-hardware.sh        # XanMod-Kernel, CPU P-State, Microcode, auto-cpufreq
+│   ├── 02-kernel-hardware.sh        # XanMod-Kernel, CPU P-State, Microcode, auto-cpufreq, Shader-Cache-Pfad
 │   ├── 03-bootloader.sh             # GRUB Kernel-Parameter, Vimix-Theme, Plymouth Solar
 │   ├── 04-packages.sh               # Installation der thematischen Paketlisten
 │   ├── 05-fonts.sh                  # Download & Installation von Coding- & Nerd-Fonts
-│   ├── 06-services.sh               # Aktivierung von AppArmor, Docker, Libvirt, zram, Ollama
+│   ├── 06-services.sh               # Aktivierung von AppArmor, Docker, Libvirt, zram, Ollama, GameMode/CoreCtrl, systemd-oomd, scx-Scheduler
 │   ├── 07-skel-and-user.sh          # /etc/skel Vorlagen, ZSH-Shell-Setzen, Dotfiles-Sync
 │   ├── 08-flatpaks.sh               # Flathub Setup, Flatpak-Paketlisten-Installation
 │   ├── 09-apps.sh                   # Spotify, Waydroid, OpenDeck, Desktop-Starter, MIME-Types
@@ -56,8 +56,10 @@ Dieses Repository ist ein modulares, automatisiertes Setup- und Konfigurations-F
 │   │   └── preferences.d/           # Pinning-Konfigurationen
 │   ├── etc/
 │   │   ├── environment.d/           # Globale Umgebungsvariablen (Raytracing, Upscaling)
+│   │   ├── gamemode.ini              # GameMode Performance-Daemon Defaults (Governor, Renice, GPU)
+│   │   ├── polkit-1/rules.d/         # 90-corectrl.rules (passwortlose CoreCtrl-Freigabe für sudo-Gruppe)
 │   │   └── profile.d/               # Globale Profil-Skripte (z. B. XDG User Dirs Update)
-│   ├── skel/                        # Vorlagen für /etc/skel (.zshrc, Dokumentvorlagen)
+│   ├── skel/                        # Vorlagen für /etc/skel (.zshrc, .config/MangoHud, .config/vkBasalt, Dokumentvorlagen)
 │   └── usr/share/applications/      # Desktop-Starter-Dateien
 ├── README.md                        # Projektdokumentation für Endanwender
 └── LICENSE                          # MIT-Lizenz
@@ -91,6 +93,7 @@ Dieses Repository ist ein modulares, automatisiertes Setup- und Konfigurations-F
   source "$SCRIPT_DIR/../lib/utils.sh"
   setup_err_trap
   ```
+- `setup_err_trap` aktiviert `errtrace`/`functrace`, damit Fehler auch innerhalb von `lib/*.sh`-Funktionen abgefangen werden, und registriert `error_handler` als ERR-Trap. Schlägt ein Befehl fehl, wird der Benutzer interaktiv gefragt, ob der Befehl **wiederholt**, **ignoriert** oder die **Installation abgebrochen** werden soll (`ask_retry_ignore_abort`). In nicht-interaktiven Läufen (`CI=1`, `DEBIAN_FRONTEND=noninteractive`, `AUTO_CONFIRM=1`, keine TTY) wird immer automatisch abgebrochen, wie zuvor.
 - Verwende für temporäre Verzeichnisse immer `mktemp -d` und stelle sicher, dass am Skriptende oder bei Fehlern aufgeräumt wird:
   ```bash
   TMP_DIR="$(mktemp -d)"
@@ -123,6 +126,8 @@ Dieses Repository ist ein modulares, automatisiertes Setup- und Konfigurations-F
 - `log_error "Nachricht"`: Rote Fehlermeldung (`[ERROR]`).
 - `log_step "Titel"`: Hervorgehobener Abschnitts-Header.
 - `log_substep "Titel"`: Eingerückter Unterabschnitt.
+- `setup_err_trap`: Aktiviert `errtrace`/`functrace` und registriert `error_handler` als ERR-Trap für das gesamte Skript (inkl. `lib/*.sh`-Funktionen).
+- `error_handler` / `ask_retry_ignore_abort` / `resume_after_error`: Zentrale Fehlerbehandlung. Bei einem fehlgeschlagenen Befehl wird interaktiv nach Wiederholen/Ignorieren/Abbrechen gefragt; nicht-interaktiv wird immer abgebrochen.
 - `require_root`: Bricht ab, wenn das Skript nicht mit Root-Rechten ausgeführt wird.
 - `command_exists "tool"`: Prüft, ob ein Befehl im Pfad verfügbar ist.
 - `prompt_target_user`: Erkennt `$SUDO_USER` oder fragt interaktiv nach dem Zielbenutzer.

README.md

@@ -109,9 +109,11 @@ Installiere nur bestimmte Phasen (z. B. nur Paketlisten und Schriften):
     │   ├── sources.list.d/          # debian-unstable.sources, xanmod.sources
     │   └── preferences.d/           # Pinning-Konfigurationen (unstable, xanmod)
     ├── etc/
-    │   ├── environment.d/           # 99-raytracing.conf, 99-upscaling.conf
+    │   ├── environment.d/           # 99-raytracing.conf, 99-upscaling.conf (99-shader-cache.conf wird optional zur Laufzeit generiert)
+    │   ├── gamemode.ini              # GameMode Performance-Daemon Defaults
+    │   ├── polkit-1/rules.d/         # 90-corectrl.rules (passwortlose CoreCtrl-Freigabe für sudo-Gruppe)
     │   └── profile.d/               # Bereinigte System-Profile-Skripte
-    ├── skel/                        # .zshrc, .config/hypr, Templates für Dokumente & Skripte
+    ├── skel/                        # .zshrc, .config/hypr, .config/MangoHud, .config/vkBasalt, Templates für Dokumente & Skripte
     └── usr/share/applications/      # Desktop-Dateien (z. B. Spotify)
 ```
 
@@ -144,6 +146,23 @@ Installiere nur bestimmte Phasen (z. B. nur Paketlisten und Schriften):
 
 ## 🎮 Gaming & Performance-Optimierungen
 
+### GameMode, MangoHud & CoreCtrl
+- **GameMode**: `stages/06-services.sh` rollt eine getunte `/etc/gamemode.ini` aus (`desiredgov=performance`, Renice, I/O-Priorität, AMD-GPU-Performance-Level `high`) und fügt den Zielbenutzer automatisch den Gruppen `gamemode` (Renice/Core-Parking) und `render` (Vulkan/GPU-Compute) hinzu.
+- **MangoHud**: `data/skel/.config/MangoHud/MangoHud.conf` liefert ein vorkonfiguriertes Overlay (FPS, Frametime, CPU/GPU-Temperatur & -Takt, VRAM/RAM, GameMode-Indikator), das über `stages/07-skel-and-user.sh` automatisch für neue und bestehende Benutzer bereitgestellt wird. Umschalten mit `Shift+F12` (Position mit `Shift+F11`).
+- **CoreCtrl**: Für Fankurven, Power-States und Undervolting von AMD-CPU/GPU. Eine PolicyKit-Regel (`90-corectrl.rules`) erlaubt Mitgliedern der `sudo`-Gruppe den Start ohne wiederholte Passwortabfrage.
+
+### systemd-oomd (Out-of-Memory-Schutz)
+- Wird aktiviert, um Einfrieren des Systems bei gleichzeitiger Speicher-/Swap-Auslastung (Spiel + Discord + Browser) zu verhindern – ergänzt das bestehende zram-Swap.
+
+### Sched-ext Gaming-Scheduler
+- **sched-ext (`scx-scheds`)**: `stages/06-services.sh` installiert das Paket aus dem bereits konfigurierten XanMod-Repository und aktiviert den Scheduler `scx_lavd` (Latency-criticality Aware Virtual Deadline – speziell für Gaming/interaktive Desktop-Workloads) im `--autopilot`-Modus über `/etc/default/scx` und `scx.service`. Benötigt einen Kernel mit `CONFIG_SCHED_CLASS_EXT` (bei XanMod bereits aktiv); nach einer frischen Kernel-Installation ist ggf. ein Neustart nötig.
+
+### vkBasalt (Vulkan-Postprocessing)
+- ReShade-ähnliche Vulkan-Postprocessing-Shader (Contrast Adaptive Sharpening als Standard) mit vorkonfigurierter `~/.config/vkBasalt/vkBasalt.conf`. Aktivierung pro Spiel über die Steam-Launch-Option `ENABLE_VKBASALT=1 %command%`; Status wird von MangoHud mit angezeigt.
+
+### Persistenter Shader-Cache (optional)
+- Standardmäßig bleiben Mesa (RADV/OpenGL) und DXVK (Wine/Proton) bei ihren eigenen Cache-Pfaden (`~/.cache/mesa_shader_cache`, `~/.cache/dxvk`). Wird `SHADER_CACHE_DIR` in `config/setup.conf` gesetzt (z. B. auf eine separate/schnelle Festplatte), verlegt `stages/02-kernel-hardware.sh` beide Caches dorthin, um Nachcompilierungs-Ruckler nach Neustarts zu vermeiden.
+
 ### CPU P-State & Kernel-Parameter
 In `stages/03-bootloader.sh` wird der CPU-Hersteller automatisch ermittelt und in `/etc/default/grub` eingetragen:
 - **AMD CPUs**: `amd_pstate=active`
@@ -157,6 +176,9 @@ gamemoderun gamescope -W 2560 -H 1440 --force-grab-cursor --hdr-enabled --adapti
 
 # Raytracing für DX12 Titel (RADV / Mesa)
 RADV_PERFTEST=gpl,rt,ngg_streamout VKD3D_CONFIG=dxr,dxr11 DXVK_ASYNC=1 AMD_VULKAN_ICD=RADV gamemoderun gamescope -W 2560 -H 1440 --force-grab-cursor --hdr-enabled --adaptive-sync -f -o 240 -r 240 -- mangohud %command%
+
+# Mit vkBasalt-Postprocessing (Schärfung via Contrast Adaptive Sharpening)
+ENABLE_VKBASALT=1 gamemoderun gamescope -W 2560 -H 1440 --force-grab-cursor --hdr-enabled --adaptive-sync -f -o 240 -r 240 -- mangohud %command%
 ```
 
 ---

config/packages/01-base.list

@@ -69,6 +69,7 @@ ripgrep
 rpi-imager
 shellcheck
 sl
+systemd-oomd
 systemd-timesyncd
 tar
 tealdeer

config/packages/03-gaming.list

@@ -2,6 +2,7 @@
 # config/packages/03-gaming.list - Gaming tools, Vulkan drivers, Wine & Emulation
 # ==============================================================================
 
+corectrl
 gameconqueror
 gamemode
 gamescope
@@ -17,6 +18,8 @@ protontricks
 radeontop
 steam-installer
 steam-devices
+vkbasalt
+vkbasalt:i386
 vulkan-tools
 wine
 winetricks

config/setup.conf

@@ -23,7 +23,17 @@ GRUB_TIMEOUT_STYLE="menu"
 # Shell & Userland
 DEFAULT_SHELL="zsh"
 
+# Gaming: Persistent Shader Cache (Mesa & DXVK)
+# Optional relocation of the shader/pipeline cache onto separate/bulk storage.
+# Leave empty to keep Mesa's and DXVK's own default cache locations
+# (~/.cache/mesa_shader_cache, ~/.cache/dxvk) - recommended unless you have a
+# specific reason (small root disk, dedicated fast scratch drive, ...).
+# Example: SHADER_CACHE_DIR="/mnt/Data/Software/mesa_shader_cache"
+SHADER_CACHE_DIR=""
+
 # Ollama AI Configuration
+# Suggested custom models path, pre-filled only if the user declines
+# Ollama's own default storage location (/usr/share/ollama/.ollama/models).
 OLLAMA_MODELS_DEFAULT="/mnt/Data/Software/ollama/models"
 OLLAMA_FLASH_ATTENTION="1"
 OLLAMA_KV_CACHE_TYPE="q8_0"

data/apt/sources.list.d/xanmod.sources

@@ -1,5 +1,5 @@
 Types: deb
 URIs: http://deb.xanmod.org
-Suites: releases
+Suites: sid
 Components: main
 Signed-By: /etc/apt/keyrings/xanmod-archive-keyring.gpg

data/etc/gamemode.ini

@@ -0,0 +1,34 @@
+# ==============================================================================
+# data/etc/gamemode.ini - GameMode performance daemon defaults
+# ==============================================================================
+# Deployed to /etc/gamemode.ini by stages/06-services.sh
+# Full reference: /usr/share/gamemode/gamemode.ini
+
+[general]
+; Use the "performance" CPU governor while a game is running instead of
+; "powersave"/"ondemand", restoring the previous governor once it exits.
+desiredgov=performance
+
+; Renice game processes for smoother frame pacing (0-20, applied as a negated
+; nice value). Requires the target user to be a member of the "gamemode"
+; group, which the setup framework adds automatically.
+renice=5
+
+; Lower I/O priority class while gaming (0 = highest Best-Effort priority).
+ioprio=0
+
+; Keep the screen from blanking/locking while a game has focus.
+inhibit_screensaver=1
+
+[gpu]
+; Apply AMD/NVIDIA GPU performance-level optimisations while gaming.
+apply_gpu_optimisations=accept-responsibility
+gpu_device=0
+
+; AMD: force the "high" DPM performance level during GameMode sessions
+; (requires an up-to-date amdgpu kernel module).
+amd_performance_level=high
+
+; NVIDIA-specific PowerMizer tuning (nv_powermizer_mode, nv_core_clock_mhz_offset,
+; nv_mem_clock_mhz_offset) requires the "coolbits" Xorg option and is not
+; configured by default, since this setup targets AMD/Intel GPUs.

data/etc/polkit-1/rules.d/90-corectrl.rules

@@ -0,0 +1,10 @@
+// Allow members of the "sudo" administrative group to start/stop CoreCtrl's
+// privileged helper without an interactive PolicyKit password prompt.
+// Deployed by stages/06-services.sh.
+polkit.addRule(function(action, subject) {
+    if ((action.id == "org.corectrl.helper.init" ||
+         action.id == "org.corectrl.helperkiller.init") &&
+        subject.isInGroup("sudo")) {
+        return polkit.Result.YES;
+    }
+});

data/skel/.config/MangoHud/MangoHud.conf

@@ -0,0 +1,35 @@
+### MangoHud default overlay configuration
+### Deployed to ~/.config/MangoHud/MangoHud.conf via stages/07-skel-and-user.sh
+### Full reference: https://github.com/flightlessmango/MangoHud/blob/master/data/MangoHud.conf
+
+# Toggle the overlay on/off with Shift+F12, move it with Shift+F11
+toggle_hud=Shift_L+F12
+toggle_hud_position=Shift_L+F11
+
+# Performance metrics
+fps
+frametime
+frame_timing
+cpu_stats
+cpu_temp
+cpu_power
+gpu_stats
+gpu_temp
+gpu_power
+gpu_core_clock
+gpu_mem_clock
+vram
+ram
+io_read
+io_write
+
+# GameMode / vkBasalt indicators
+gamemode
+vkbasalt
+
+# Presentation
+position=top-left
+background_alpha=0.4
+font_size=20
+round_corners=6
+table_columns=3

data/skel/.config/vkBasalt/vkBasalt.conf

@@ -0,0 +1,18 @@
+### vkBasalt default post-processing configuration
+### Deployed to ~/.config/vkBasalt/vkBasalt.conf via stages/07-skel-and-user.sh
+### Full reference: https://github.com/DadSchoorse/vkBasalt
+###
+### Only active for games launched with ENABLE_VKBASALT=1, e.g. as a Steam
+### launch option: ENABLE_VKBASALT=1 %command%
+
+# Effect chain to apply, in order
+effects = cas
+
+# Contrast Adaptive Sharpening strength (0.0 - 1.0)
+casSharpness = 0.4
+
+# Apply the effect chain immediately without needing to press toggleKey first
+enableOnLaunch = True
+
+# Key to toggle all effects on/off at runtime
+toggleKey = Home

lib/utils.sh

@@ -58,15 +58,101 @@ log_substep() {
 
 # Error trap handler
 setup_err_trap() {
+    # Required so the ERR trap also fires for failures inside sourced
+    # lib/*.sh functions (errtrace) and nested function calls (functrace),
+    # not just for top-level commands in the stage script itself.
+    set -o errtrace
+    set -o functrace
     trap 'error_handler $? $LINENO "$BASH_COMMAND"' ERR
 }
 
+# Re-arms 'set -e' for the *next* command only, via a self-removing DEBUG
+# trap. Bash normally terminates the script right after an ERR trap when
+# errexit is set, no matter what the trap does - the only way to make the
+# script actually resume past the failed line is to have errexit disabled
+# at the moment the trap returns. Must be the very last statement executed
+# on the "resume" path (no trailing 'return'/'break'/...): any further
+# command run inside error_handler itself would consume the DEBUG trap's
+# one-shot reset before control ever gets back to the failed line.
+resume_after_error() {
+    set +e
+    trap 'set -e; trap - DEBUG' DEBUG
+}
+
+# Ask the user what to do about a failed command.
+# Echoes one of: r (retry), i (ignore), a (abort). Defaults to "a" when
+# not running interactively (piped install, CI, DEBIAN_FRONTEND=noninteractive,
+# AUTO_CONFIRM=1) or when the prompt can't be read, so unattended installs
+# keep failing hard exactly like before this feature existed.
+ask_retry_ignore_abort() {
+    local is_interactive=0
+    if { [[ -t 0 ]] || has_tty; } && [[ "${DEBIAN_FRONTEND:-}" != "noninteractive" && "${CI:-}" != "1" && "${AUTO_CONFIRM:-}" != "1" ]]; then
+        is_interactive=1
+    fi
+
+    if [[ "$is_interactive" -ne 1 ]]; then
+        echo "a"
+        return 0
+    fi
+
+    local tty_in="/dev/tty"
+    local tty_out="/dev/tty"
+    if ! has_tty; then
+        tty_in="/dev/stdin"
+        tty_out="/dev/stderr"
+    fi
+
+    local prompt answer=""
+    prompt="$(printf "%b[W]iederholen%b / %b[i]gnorieren%b / %b[a]bbrechen%b (Standard: a): " \
+        "$CLR_BOLD" "$CLR_RESET" "$CLR_BOLD" "$CLR_RESET" "$CLR_BOLD" "$CLR_RESET")"
+    read -r -p "$prompt" answer < "$tty_in" > "$tty_out" 2>&1 || answer="a"
+    answer="$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' <<< "$answer")"
+
+    case "$answer" in
+        [Ww]*) echo "r" ;;
+        [Ii]*) echo "i" ;;
+        *) echo "a" ;;
+    esac
+}
+
 error_handler() {
     local exit_code="$1"
     local line_no="$2"
     local bash_command="$3"
+
     log_error "Command failed with exit code $exit_code at line $line_no: '$bash_command'"
+
+    local choice
+    choice="$(ask_retry_ignore_abort)"
+
+    case "$choice" in
+        r)
+            # Bare shell keywords (return/exit/break/continue) can't be
+            # meaningfully re-run via eval - they'd just unwind the current
+            # function instead of redoing any actual work. Treat these like
+            # "ignore" instead of silently aborting on a nonsensical retry.
+            if [[ "$bash_command" =~ ^(return|exit|break|continue)([[:space:]]|$) ]]; then
+                log_warn "'$bash_command' kann nicht wiederholt werden - Fehler wird ignoriert."
+                resume_after_error
+            else
+                log_info "Wiederhole: $bash_command"
+                if eval "$bash_command"; then
+                    log_success "Wiederholung erfolgreich, Installation wird fortgesetzt."
+                    resume_after_error
+                else
+                    error_handler "$?" "$line_no" "$bash_command"
+                fi
+            fi
+            ;;
+        i)
+            log_warn "Fehler wird ignoriert, Installation wird fortgesetzt: $bash_command"
+            resume_after_error
+            ;;
+        *)
+            log_error "Installation abgebrochen."
             exit "$exit_code"
+            ;;
+    esac
 }
 
 # Root permission check
@@ -135,6 +221,23 @@ run_whiptail() {
     fi
 }
 
+# Ask a yes/no question on the CLI. Returns 0 for yes, 1 for no.
+# On read failure (e.g. closed stdin), falls back to default_answer.
+# Usage: confirm_yes_no "<prompt>" "<y|n default answer>" "$tty_in" "$tty_out"
+confirm_yes_no() {
+    local prompt="$1"
+    local default_answer="$2"
+    local tty_in="$3"
+    local tty_out="$4"
+    local answer=""
+    read -r -p "$prompt" answer < "$tty_in" > "$tty_out" 2>&1 || answer="$default_answer"
+    answer="$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' <<< "$answer")"
+    if [[ -z "$answer" ]]; then
+        answer="$default_answer"
+    fi
+    [[ "$answer" =~ ^[YyJj] ]]
+}
+
 # Determine and prompt for the non-root target user
 prompt_target_user() {
     if [[ -n "${TARGET_USER:-}" ]]; then
@@ -173,9 +276,7 @@ prompt_target_user() {
         if [[ -n "$candidate" && "$candidate" != "root" ]]; then
             printf "\n%bTarget User Detection:%b\n" "${CLR_CYAN}" "${CLR_RESET}" > "$tty_out"
             printf "Detected target user: %b%s%b\n" "${CLR_BOLD}" "$candidate" "${CLR_RESET}" > "$tty_out"
-            local answer=""
-            read -r -p "Use target user '$candidate'? [Y/n]: " answer < "$tty_in" > "$tty_out" 2>&1 || answer="y"
-            if [[ -z "$answer" || "$answer" =~ ^[YyJj] ]]; then
+            if confirm_yes_no "Use target user '$candidate'? [Y/n]: " "y" "$tty_in" "$tty_out"; then
                 chosen="$candidate"
             fi
         fi
@@ -240,7 +341,12 @@ prompt_ollama_models_path() {
         return 0
     fi
 
-    local default_path="${OLLAMA_MODELS_DEFAULT:-/mnt/Data/Software/ollama/models}"
+    # Ollama's own default storage location (used by the official install
+    # script / systemd service, which runs as the "ollama" user).
+    local ollama_default_path="/usr/share/ollama/.ollama/models"
+    # Suggested custom path, only ever pre-filled once the user has
+    # explicitly declined the Ollama default above.
+    local custom_path_suggestion="${OLLAMA_MODELS_DEFAULT:-/mnt/Data/Software/ollama/models}"
     local chosen=""
     local is_interactive=0
     if { [[ -t 0 ]] || has_tty; } && [[ "${DEBIAN_FRONTEND:-}" != "noninteractive" && "${CI:-}" != "1" && "${AUTO_CONFIRM:-}" != "1" ]]; then
@@ -255,40 +361,56 @@ prompt_ollama_models_path() {
             tty_out="/dev/stderr"
         fi
 
-        # If whiptail is available and running on an active terminal, use whiptail dialog
+        # If whiptail is available and running on an active terminal, first ask
+        # whether Ollama's own default path should be used, and only show the
+        # free-text path dialog (pre-filled with the custom suggestion) if not.
         if command_exists whiptail && has_tty; then
+            local yesno_status=0
+            run_whiptail --title "Ollama KI-Modelle Speicherort" \
+                --yes-button "Standard verwenden" --no-button "Eigenen Pfad angeben" \
+                --yesno "Standard-Speicherort für Ollama-Modelle:\n\n$ollama_default_path\n\nMöchtest du diesen Speicherort verwenden?" \
+                12 70 || yesno_status=$?
+            if [[ "$yesno_status" -eq 0 || "$yesno_status" -eq 255 ]]; then
+                # Yes, or ESC/Cancel (255) - use the Ollama default,
+                # consistent with the inputbox fallback below where an
+                # empty or cancelled dialog also keeps its own default
+                # instead of asking again.
+                chosen="$ollama_default_path"
+            fi
+
+            if [[ -z "$chosen" ]]; then
                 local tui_tmp
                 tui_tmp="$(mktemp)"
                 if run_whiptail --output-fd 3 --title "Ollama KI-Modelle Speicherort" \
                     --inputbox "Bitte gib den Speicherort für die Ollama KI-Modelle an:" \
-                10 70 "$default_path" \
+                    10 70 "$custom_path_suggestion" \
                     3> "$tui_tmp"; then
-                local tui_input
-                tui_input="$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' < "$tui_tmp")"
-                if [[ -n "$tui_input" ]]; then
-                    chosen="$tui_input"
-                else
-                    chosen="$default_path"
-                fi
+                    chosen="$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' < "$tui_tmp")"
                 fi
                 rm -f "$tui_tmp"
+                [[ -z "$chosen" ]] && chosen="$custom_path_suggestion"
+            fi
         fi
 
         # CLI fallback if whiptail was not used or failed
         if [[ -z "$chosen" ]]; then
             printf "\n%bOllama KI-Modelle Speicherort:%b\n" "${CLR_CYAN}" "${CLR_RESET}" > "$tty_out"
-            printf "Standard-Pfad: %b%s%b\n" "${CLR_BOLD}" "$default_path" "${CLR_RESET}" > "$tty_out"
+            printf "Standard-Pfad: %b%s%b\n" "${CLR_BOLD}" "$ollama_default_path" "${CLR_RESET}" > "$tty_out"
+            if confirm_yes_no "Standard-Speicherort verwenden? [J/n]: " "j" "$tty_in" "$tty_out"; then
+                chosen="$ollama_default_path"
+            else
                 local input_path=""
-            read -r -p "Speicherort für Ollama-Modelle eingeben [$default_path]: " input_path < "$tty_in" > "$tty_out" 2>&1 || true
+                read -r -p "Speicherort für Ollama-Modelle eingeben [$custom_path_suggestion]: " input_path < "$tty_in" > "$tty_out" 2>&1 || true
                 input_path="$(echo "$input_path" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
                 if [[ -n "$input_path" ]]; then
                     chosen="$input_path"
                 else
-                chosen="$default_path"
+                    chosen="$custom_path_suggestion"
+                fi
             fi
         fi
     else
-        chosen="$default_path"
+        chosen="$ollama_default_path"
     fi
 
     export OLLAMA_MODELS="$chosen"

stages/02-kernel-hardware.sh

@@ -120,6 +120,24 @@ if compgen -G "$SCRIPT_DIR/data/etc/environment.d/*.conf" > /dev/null; then
     done
 fi
 
+# 6. Persistent Shader Cache Location (Mesa & DXVK) - optional relocation
+if [[ -n "${SHADER_CACHE_DIR:-}" ]]; then
+    log_substep "Configuring custom Mesa/DXVK shader cache location..."
+    TARGET_USER="${TARGET_USER:-$(prompt_target_user)}"
+    mkdir -p "$SHADER_CACHE_DIR"
+    chown -R "$TARGET_USER:$TARGET_USER" "$SHADER_CACHE_DIR"
+    cat <<EOF > /etc/environment.d/99-shader-cache.conf
+# Persistent Mesa (RADV/OpenGL) & DXVK (Wine/Proton) shader/pipeline cache,
+# relocated off the system disk to avoid re-compilation stutter after reboots.
+MESA_SHADER_CACHE_DIR=$SHADER_CACHE_DIR
+DXVK_STATE_CACHE_PATH=$SHADER_CACHE_DIR
+EOF
+    chmod 0644 /etc/environment.d/99-shader-cache.conf
+    log_success "Shader cache directory set to $SHADER_CACHE_DIR"
+else
+    log_info "SHADER_CACHE_DIR not set - keeping Mesa's and DXVK's own default shader cache locations."
+fi
+
 create_timeshift_snapshot "Stage 02: Post-kernel and hardware tuning" "O"
 
 log_success "Stage 02: Kernel and Hardware Tuning completed successfully!"

stages/06-services.sh

@@ -162,6 +162,66 @@ usermod -aG sudo,docker,netdev "$TARGET_USER"
 if getent group ollama >/dev/null 2>&1; then
     usermod -aG ollama "$TARGET_USER" 2>/dev/null || true
 fi
-log_success "Target user $TARGET_USER added to sudo, docker, netdev and ollama groups."
+# "render" (GPU compute/Vulkan access) is created by Debian's udev sysusers
+# config and is always present; "gamemode" only exists once the gamemode
+# package is installed (stage 04), so it is added conditionally.
+if getent group render >/dev/null 2>&1; then
+    usermod -aG render "$TARGET_USER" 2>/dev/null || true
+fi
+if getent group gamemode >/dev/null 2>&1; then
+    usermod -aG gamemode "$TARGET_USER" 2>/dev/null || true
+fi
+log_success "Target user $TARGET_USER added to sudo, docker, netdev, ollama, render and gamemode groups."
+
+# 9. GameMode Performance Daemon & CoreCtrl Configuration
+log_substep "Deploying GameMode performance configuration..."
+if [[ -f "$SCRIPT_DIR/data/etc/gamemode.ini" ]]; then
+    backup_file_or_dir "/etc/gamemode.ini"
+    cp "$SCRIPT_DIR/data/etc/gamemode.ini" /etc/gamemode.ini
+    chmod 0644 /etc/gamemode.ini
+    log_success "GameMode configuration deployed to /etc/gamemode.ini."
+fi
+
+log_substep "Configuring passwordless CoreCtrl access for administrative users..."
+if [[ -f "$SCRIPT_DIR/data/etc/polkit-1/rules.d/90-corectrl.rules" ]]; then
+    mkdir -p /etc/polkit-1/rules.d
+    cp "$SCRIPT_DIR/data/etc/polkit-1/rules.d/90-corectrl.rules" /etc/polkit-1/rules.d/90-corectrl.rules
+    chmod 0644 /etc/polkit-1/rules.d/90-corectrl.rules
+    log_success "CoreCtrl PolicyKit rule installed for the 'sudo' group."
+fi
+
+# 10. systemd-oomd Out-of-Memory Protection
+log_substep "Enabling systemd-oomd out-of-memory protection..."
+if command_exists systemctl; then
+    systemctl enable --now systemd-oomd.service 2>/dev/null || log_warn "Could not enable systemd-oomd.service."
+    log_success "systemd-oomd enabled (protects against freezes under heavy memory/swap pressure)."
+fi
+
+# 11. Sched-ext (scx) Gaming Scheduler
+log_substep "Configuring sched-ext (scx) gaming scheduler..."
+apt_ensure_keyrings_dir
+apt_add_keyring_from_url "https://dl.xanmod.org/archive.key" "xanmod-archive-keyring.gpg" || true
+if [[ -f "$SCRIPT_DIR/data/apt/sources.list.d/xanmod.sources" ]]; then
+    apt_install_sources_file "$SCRIPT_DIR/data/apt/sources.list.d/xanmod.sources" "xanmod.sources"
+fi
+apt_update
+if DEBIAN_FRONTEND=noninteractive apt-get install -y scx-scheds 2>/dev/null; then
+    if [[ -f /etc/default/scx ]]; then
+        # scx_lavd (Latency-criticality Aware Virtual Deadline) is purpose-built
+        # for gaming/interactive desktop workloads; --autopilot lets it balance
+        # performance vs. powersave automatically based on system load.
+        sed -i 's|^SCX_SCHEDULER=.*|SCX_SCHEDULER=scx_lavd|' /etc/default/scx
+        grep -q '^SCX_SCHEDULER=' /etc/default/scx || echo "SCX_SCHEDULER=scx_lavd" >> /etc/default/scx
+        sed -i "s|^#\?SCX_FLAGS=.*|SCX_FLAGS='--autopilot'|" /etc/default/scx
+        grep -q '^SCX_FLAGS=' /etc/default/scx || echo "SCX_FLAGS='--autopilot'" >> /etc/default/scx
+    fi
+    if command_exists systemctl; then
+        systemctl daemon-reload 2>/dev/null || true
+        systemctl enable --now scx.service 2>/dev/null || log_warn "scx.service could not be started - a reboot into a sched_ext-capable kernel (e.g. XanMod) may be required."
+    fi
+    log_success "sched-ext gaming scheduler (scx_lavd) configured and enabled."
+else
+    log_warn "Could not install scx-scheds. Skipping sched-ext scheduler configuration."
+fi
 
 log_success "Stage 06: System services configuration completed successfully!"